CN108821640B - Concrete mortar anti-cracking additive and preparation method thereof - Google Patents
Concrete mortar anti-cracking additive and preparation method thereof Download PDFInfo
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- CN108821640B CN108821640B CN201810806769.0A CN201810806769A CN108821640B CN 108821640 B CN108821640 B CN 108821640B CN 201810806769 A CN201810806769 A CN 201810806769A CN 108821640 B CN108821640 B CN 108821640B
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- 239000004567 concrete Substances 0.000 title claims abstract description 33
- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 21
- 238000005336 cracking Methods 0.000 title claims abstract description 19
- 239000000654 additive Substances 0.000 title claims abstract description 18
- 230000000996 additive effect Effects 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000000839 emulsion Substances 0.000 claims abstract description 30
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 27
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 24
- 239000000084 colloidal system Substances 0.000 claims abstract description 22
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 9
- PHOQVHQSTUBQQK-SQOUGZDYSA-N D-glucono-1,5-lactone Chemical compound OC[C@H]1OC(=O)[C@H](O)[C@@H](O)[C@@H]1O PHOQVHQSTUBQQK-SQOUGZDYSA-N 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 7
- 235000012209 glucono delta-lactone Nutrition 0.000 claims abstract description 6
- 229960003681 gluconolactone Drugs 0.000 claims abstract description 6
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims description 15
- 229910021641 deionized water Inorganic materials 0.000 claims description 15
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 12
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 12
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- IGFHQQFPSIBGKE-UHFFFAOYSA-N Nonylphenol Natural products CCCCCCCCCC1=CC=C(O)C=C1 IGFHQQFPSIBGKE-UHFFFAOYSA-N 0.000 claims description 9
- 239000007864 aqueous solution Substances 0.000 claims description 9
- SNQQPOLDUKLAAF-UHFFFAOYSA-N nonylphenol Chemical compound CCCCCCCCCC1=CC=CC=C1O SNQQPOLDUKLAAF-UHFFFAOYSA-N 0.000 claims description 9
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 9
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 6
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 6
- 125000003903 2-propenyl group Chemical group [H]C([*])([H])C([H])=C([H])[H] 0.000 claims description 6
- 101000651178 Homo sapiens Striated muscle preferentially expressed protein kinase Proteins 0.000 claims description 6
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims description 6
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims description 6
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 6
- 102100027659 Striated muscle preferentially expressed protein kinase Human genes 0.000 claims description 6
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 6
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 4
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 3
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000007865 diluting Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000004945 emulsification Methods 0.000 claims description 3
- 239000003995 emulsifying agent Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 5
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 abstract description 3
- 230000000694 effects Effects 0.000 abstract description 3
- 230000036571 hydration Effects 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 230000011987 methylation Effects 0.000 abstract description 2
- 238000007069 methylation reaction Methods 0.000 abstract description 2
- 239000004568 cement Substances 0.000 description 8
- 239000003795 chemical substances by application Substances 0.000 description 7
- 238000005452 bending Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 206010016807 Fluid retention Diseases 0.000 description 1
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011372 high-strength concrete Substances 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a concrete mortar anti-cracking additive and a preparation method thereof, wherein the anti-cracking additive comprises 10-40% of polyacrylate emulsion, 10-40% of polyacrylamide colloid, 0.2-2.0% of gluconolactone, 0.2-2.0% of silane coupling agent and the balance of water. The addition of the mortar additive has obvious improvement on cracks generated by mortar stress. The mixture relates to plasma polyacrylamide methylation and is crosslinked with 2-acrylamide-2-methylpropanesulfonic acid, so that the silicate is slowly released in the hydration process, and the effect of eliminating stress is achieved.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a concrete mortar anti-cracking admixture and a preparation method thereof.
Background
The common concrete is a structure or member with certain structural strength, which is prepared by mixing cement as a cementing material, sand and stone as aggregates, and water (with or without additives and admixtures) according to a certain proportion, and stirring, molding, curing and hardening. The cement is the main component of concrete, determines the basic properties of concrete, and the concrete admixture can make up and improve the defects of concrete performance, endow certain new performances, and is an important component of concrete.
When the mortar concrete is hydrated and consolidated by silicate, stress joints appear in the mortar concrete due to stress, micro-expansion and expansion caused by violent heat release.
The concrete admixture lays the foundation of modern concrete technology and becomes one of the indispensable important components of concrete. The admixture comprises a water reducing agent, a retarder, an antifreezing agent, an air entraining agent, an antirust agent and the like, and the admixture with various varieties and different functions is widely applied at present, so that the working performance, the mechanical property and the durability of concrete are effectively improved, and the high-fluidity concrete, the self-compacting concrete and the high-strength concrete are applied due to the high-efficiency water reducing agent; due to the thickener, the segregation resistance and the water retention of the concrete are enhanced, and the performance of the underwater concrete is improved; because of the retarder, the setting time of the cement is prolonged, so that the slump loss can be reduced, and the construction operation time is prolonged; the concrete added with some additives with anti-cracking function can improve the anti-cracking performance of the concrete.
Disclosure of Invention
The invention aims to provide a concrete mortar anti-cracking additive and a preparation method thereof, wherein the additive is applied to the forming of cement-based artificial stone square stock, solves the problems of heat release generated in the hydration process of mortar concrete and eliminates cracks generated by stress, thereby achieving the utilization rate of the square stock and reducing the loss of the square stock in the manufacturing process.
In order to solve the technical problems, the invention adopts the following technical scheme:
the concrete mortar anti-cracking additive comprises the following components in percentage by weight:
the concrete mortar anti-cracking additive comprises the following components in percentage by weight:
further, the polyacrylate emulsion comprises the following components in percentage by weight:
5-20% of methyl methacrylate, 1-5% of methacrylic acid, 5-20% of butyl acrylate, 1-5% of acrylic acid, 0.1-0.5% of emulsifier sodium dodecyl sulfate, 0.1-0.5% of nonylphenol polyoxyethylene ether, 0.1% of potassium persulfate and the balance of deionized water.
Further, the polyacrylate emulsion is prepared by the following method:
firstly, preparing potassium persulfate into an aqueous solution with the mass concentration of 5% for later use, then taking deionized water with the total amount of 60%, adding nonylphenol polyoxyethylene ether with the total amount of 30% and all sodium dodecyl sulfate into the deionized water, mixing and dissolving, and then adding all methyl methacrylate, methacrylic acid, butyl acrylate and acrylic acid for pre-emulsification for 20 minutes to obtain a pre-emulsion for later use;
adding the rest 40% of deionized water into a reactor, adding the rest 70% of nonylphenol polyoxyethylene ether, 10% of pre-emulsion and 30% of potassium persulfate aqueous solution, heating to 65-85 ℃, starting to respectively dropwise add the rest pre-emulsion and potassium persulfate aqueous solution when the reaction system emits blue light, completing dropwise addition within 5 hours, keeping the temperature for 2 hours, cooling to below 40 ℃, adjusting the pH value to 8-9 by using ammonia water, and discharging to obtain the polyacrylate emulsion.
Further, the polyacrylamide colloid comprises the following components in percentage by weight:
8% of acrylamide, 1% of 2-acrylamido-2-methylpropanesulfonic acid, 2% of SPEG allyl polyether, 0.05% of ammonium persulfate, 0.05% of sodium bisulfite and the balance of deionized water.
Further, the polyacrylamide colloid is prepared by the following method:
firstly, adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and SPEG allyl polyether into water, stirring and dissolving, heating to 40-80 ℃, adding ammonium persulfate and sodium bisulfite, preserving heat for 30-40 minutes until the mixture is gelled, continuing preserving heat for 6 hours, and diluting with water to obtain polyacrylamide colloid with the solid content of the acrylamide monomer being 3%.
Further, the silane coupling agent is KH series, KH550, KH560, KH570 and the like of Nanjing' Chuangshi chemical assistant Co.
The preparation method of the concrete mortar anti-cracking additive comprises the following steps:
s1, adding polyacrylamide colloid with the solid content of 3% and water into a reactor, heating the reactor to 40-80 ℃, adding glucolactone and a silane coupling agent, and keeping the temperature for 2 hours;
s2, cooling the reactant to normal temperature;
s3, adding the polyacrylate emulsion, stirring and curing for 2 h.
Compared with the prior art, the invention has the following beneficial effects: the addition of the mortar additive has obvious improvement on cracks generated by mortar stress. The mixture relates to plasma polyacrylamide methylation and is crosslinked with 2-acrylamide-2-methylpropanesulfonic acid, so that the silicate is slowly released in the hydration process, and the effect of eliminating stress is achieved.
Detailed Description
In order that those skilled in the art will more clearly and intuitively understand the present invention, the present invention will be further described below.
The invention provides a concrete mortar anti-cracking additive which comprises the following components in percentage by weight:
the polyacrylate emulsion and the polyacrylamide colloid are self-produced products, and the polyacrylate emulsion comprises the following components in percentage by weight: 5-20% of methyl methacrylate, 1-5% of methacrylic acid, 5-20% of butyl acrylate, 1-5% of acrylic acid, 0.1-0.5% of emulsifier lauryl sodium sulfate, 0.1-0.5% of nonylphenol polyoxyethylene ether, 0.1% of potassium persulfate and the balance of deionized water, and the preparation method comprises the following steps:
firstly, preparing potassium persulfate into an aqueous solution with the mass concentration of 5% for later use, then taking deionized water with the total amount of 60%, adding nonylphenol polyoxyethylene ether with the total amount of 30% and all sodium dodecyl sulfate into the deionized water, mixing and dissolving, and then adding all methyl methacrylate, methacrylic acid, butyl acrylate and acrylic acid for pre-emulsification for 20 minutes to obtain a pre-emulsion for later use; adding the rest 40% of deionized water into a reactor, adding the rest 70% of nonylphenol polyoxyethylene ether, 10% of pre-emulsion and 30% of potassium persulfate aqueous solution, heating to 65-85 ℃, starting to respectively dropwise add the rest pre-emulsion and potassium persulfate aqueous solution when the reaction system emits blue light, completing dropwise addition within 5 hours, keeping the temperature for 2 hours, cooling to below 40 ℃, adjusting the pH value to 8-9 by using ammonia water, and discharging to obtain the polyacrylate emulsion.
The polyacrylamide colloid comprises the following components in percentage by weight: 8% of acrylamide, 1% of 2-acrylamido-2-methylpropanesulfonic acid, 2% of SPEG allyl polyether, 0.05% of ammonium persulfate, 0.05% of sodium bisulfite and the balance of deionized water, wherein the polyacrylamide colloid is prepared by the following method:
firstly, adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and SPEG allyl polyether into water, stirring and dissolving, heating to 40-80 ℃, adding ammonium persulfate and sodium bisulfite, preserving heat for 30-40 minutes until the mixture is gelled, continuing preserving heat for 6 hours, and diluting with water to obtain polyacrylamide colloid with the solid content of the acrylamide monomer being 3%.
The silane coupling agent is KH series of KH550, KH560 and KH570 of Nanjing' Chuangshi chemical assistant Co. KH560 is selected in the examples.
Example 1: (the amount of water is supplemented to 100% under the condition that the amounts of the gluconolactone and the silane coupling agent are 1.5%) are not changed), the proportion of the polyacrylate and the polyacrylamide colloid is taken as an example.
As can be seen from the above table, when the admixture is 5% of the cement dosage, the larger the mixture ratio of the polyacrylate emulsion and the polyacrylamide gel is, the higher the dry bending strength is, and the compression strength is not changed much when approaching 50: 50.
Example 2 (the amount of water is supplemented to 100% under the condition that the amounts of the gluconolactone and the silane coupling agent are 1.5%) are not changed) by taking the ratio of the polyacrylate to the polyacrylamide colloid as an example:
as can be seen from the above table, when the admixture is added in an amount of 6% of the cement amount, the larger the ratio of the polyacrylate emulsion to the polyacrylamide gel is, the more the improvement of the dry flexural strength is evident as compared with example 1, and the compressive strength is reduced as it approaches 50: 50.
Example 3: (under the condition that the dosage of the gluconolactone is 1.5 percent and the dosage of the silane coupling agent is 1.5 percent, the dosage of the water is supplemented to 100 percent) by taking the proportion of the polyacrylate and the polyacrylamide colloid as an example
As can be seen from the above table, when the admixture is 8% of the cement dosage, the larger the mixture ratio of the polyacrylate emulsion and the polyacrylamide colloid is, the more obvious the improvement of the dry bending strength is compared with the former two examples, and the compression strength is obviously reduced when the admixture is close to 50: 50.
From the above, it can be concluded that: when the bending strength approaches a critical point, the bending strength is continuously improved and the compressive strength is reduced when the addition of the anti-cracking agent is increased by 1 percent.
The following cement sand cubes were used as an example in a 3 cubic meter unit, and 6 were used as a group, and the results are given in the following table, based on the number of cracks that occurred:
the anti-cracking agent in the ratio of the polyacrylate emulsion to the polyacrylamide colloid is taken as an example 20:80, and the results are shown in the following table:
from the above table, it can be seen that when the ratio of the polyacrylate emulsion to the polyacrylamide gel is 20:80, the addition amount of the anti-cracking agent is in the range of 0-8%, and the anti-cracking effect is better as the addition amount of the anti-cracking agent is increased.
The anti-cracking agent in the ratio of the polyacrylate emulsion to the polyacrylamide colloid is taken as an example 30:70, and the results are shown in the following table:
the mixing ratio of the polyacrylate emulsion to the polyacrylamide colloid is 40:60, and the results are as follows:
in the examples in the tables, the stress-induced fractures are significantly improved by the incorporation of the additive. The invention has strong practicability for improving cracks caused by mortar concrete stress.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. The concrete mortar anti-cracking additive is characterized by comprising the following components in percentage by weight:
10-40% of polyacrylate emulsion;
10-40% of polyacrylamide colloid;
0.2 to 2.0 percent of gluconolactone;
0.2 to 2.0 percent of silane coupling agent;
the balance of water;
wherein, the polyacrylate emulsion comprises the following components in percentage by weight:
5-20% of methyl methacrylate, 1-5% of methacrylic acid, 5-20% of butyl acrylate, 1-5% of acrylic acid, 0.1-0.5% of emulsifier sodium dodecyl sulfate, 0.1-0.5% of nonylphenol polyoxyethylene ether, 0.1% of potassium persulfate and the balance of deionized water;
the polyacrylate emulsion is prepared by the following method: firstly, preparing potassium persulfate into an aqueous solution with the mass concentration of 5% for later use, then taking deionized water with the total amount of 60%, adding nonylphenol polyoxyethylene ether with the total amount of 30% and all sodium dodecyl sulfate into the deionized water, mixing and dissolving, and then adding all methyl methacrylate, methacrylic acid, butyl acrylate and acrylic acid for pre-emulsification for 20 minutes to obtain a pre-emulsion for later use; adding the residual deionized water accounting for 40 percent of the total amount into a reactor, adding the residual nonylphenol polyoxyethylene ether accounting for 70 percent of the total amount, the pre-emulsion accounting for 10 percent of the total amount and the potassium persulfate aqueous solution accounting for 30 percent of the total amount, heating to 65-85 ℃, starting to respectively dropwise add the residual pre-emulsion and the potassium persulfate aqueous solution when the reaction system emits blue light, completing dropwise addition within 5 hours, keeping the temperature for 2 hours, cooling to below 40 ℃, adjusting the pH value to 8-9 by using ammonia water, and discharging to obtain the polyacrylate emulsion;
the polyacrylamide colloid comprises the following components in percentage by weight:
8% of acrylamide, 1% of 2-acrylamido-2-methylpropanesulfonic acid, 2% of SPEG allyl polyether, 0.05% of ammonium persulfate, 0.05% of sodium bisulfite and the balance of deionized water;
the polyacrylamide colloid is prepared by the following method: firstly, adding acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and SPEG allyl polyether into water, stirring and dissolving, heating to 40-80 ℃, adding ammonium persulfate and sodium bisulfite, preserving heat for 30-40 minutes until the mixture is gelled, continuing preserving heat for 6 hours, and diluting with water to obtain polyacrylamide colloid with the solid content of the acrylamide monomer being 3%.
2. The concrete mortar anti-crack additive according to claim 1, which comprises the following components in percentage by weight:
10-40% of polyacrylate emulsion;
10-40% of polyacrylamide colloid;
1.5% of gluconolactone;
1.5% of a silane coupling agent;
the balance of water.
3. The concrete mortar anti-crack additive according to claim 1 or 2, wherein the silane coupling agent is KH series of the Nanjing Chuangshi chemical assistant Co., Ltd: KH550, KH560 and KH 570.
4. The method for preparing the concrete mortar crack resistance admixture according to claim 1 or 2, comprising the steps of:
s1, adding polyacrylamide colloid and water into a reactor, heating the reactor to 40-80 ℃, adding glucolactone and a silane coupling agent, and keeping the temperature for 2 hours;
s2, cooling the reactant to normal temperature;
s3, adding the polyacrylate emulsion, stirring and curing for 2 h.
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| CN109987873A (en) * | 2018-12-26 | 2019-07-09 | 四川正大新材料科技有限公司 | Silica acroleic acid resin additive and its preparation method and application |
| CN112390586B (en) * | 2020-12-02 | 2022-04-29 | 唐山友顺混凝土有限公司 | High-strength concrete and preparation method thereof |
| CN115959850B (en) * | 2022-11-09 | 2024-05-03 | 河海大学 | Carbon-fixing anti-cracking additive and preparation method and application method thereof |
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